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What Lamb refers to as "quality" of a note also is referred to as the timbre of a tone, that is, the subjective perceived quality of a tone that distinguishes different voices. †Such as the manner in which the sound sets in and ceases this is different for instance in the violin and the piano. By "quality" is meant that unmistakable character which distinguishes a note on one instrument from the note of same pitch as given by another.difference of quality, so far as it is not due to adventitious circumstances, † can only be ascribed to differences of vibration-form, and so to differences in the relative amplitude and phases of the simple-harmonic constituents. that of lowest frequency, but if the amplitude of this first component be relatively small, and especially if it fall near the lower limit of the audible scale, the estimated pitch may be that of the second component. The pitch is usually estimated as that of the first simple-harmonic vibration in the series, viz. To quote Lamb: One musical note may differ from another in respect of pitch, quality, and loudness. As a result, for other than simple tones, pitch is not a purely objective physical property it is a subjective psychoacoustical attribute of a sound. A laboratory determination of pitch is made by a subject listening to a tone from a musical instrument and to a simple tone, such as that produced by a tuning fork, and identifying circumstances where the instrument and the simple tone sound alike. Pitch is one of several perceived attributes of a tone. Ī musical instrument on the other hand, produces a tone, which is a superposition of various frequencies with various amplitudes and phases peculiar to the instrument, and which also is affected by the manner of play that determines the sound envelope of the note (referred to by Lamb below as "adventitious circumstances"). The amplitude of a musical note varies in time according to its sound envelope.